phyphy! Reflection of light
本帖最後由 myloveareyou 於 12-6-2010 17:34 編輯why is it difficult to read the prints on glossy paper under a desk lamp?
when a boy walks 10 m away fron a plane mirror, his image will move 10M away from the mirror and its size decreases? yes or no
有冇人知點 好急!!幫幫手 唔該 1. diffraction
2. yes.
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